Chap. 1 3. ATreuife of BODIES. i- 



us conceive the cloth C E to be of fome thickncfle, and fb draw 

 the line O P to determine that thickneffe. And let us make from 

 B upon A L, another Parallelogram like the Parallelogram 

 A L, whofe diameter fhall be B Q^ And it muft neceflarily fol- 

 low that the motion from B to Q^, if there were no refiftance, 

 were in the fame proportion as from A to B.But the proportion 

 ofthc motion from A to B, is the proportion ofCB to CA;thac 

 is, it goeth in the fame time fafler towards D, then it doth to- 

 wards M, in the proportion which CB hath to CA. By which 

 account, the refiftance it hath in the way towards D, muft alfo 

 be greater then the refiftance it hath in the way towards M, in 

 the proportion which CB hath to CA; and therefore tlfc more 

 tardity muft be in the way to D, and not in the way to M;and 

 confequently, the declination muft be from E wards, and to M 

 wards. For where there is moft refiftance, that way likcwifc 

 muft the tardity be greateft,& the declination muft be from that 

 way:but which way thethicknefle.to be parted in the fame time, 

 is moft, that way the refiftance is greateft : and the thicknefle is 

 clearly greater towards E, then towards M; therefore, the refi - 

 ftance muft be greateft towards E; confequently the declinati- 

 on from the line BL muft be towards M, and not towards E. 



But the truth is, that in his do$rine the ball would go in a 

 ftraighc line as if there were noref.ftanc?; unlefTe peradvemure 

 towards the contrary fide of the cloth, at which it goeth oJt in- 

 to the free aire : for as the rcfiftauce ofthc cloth is greater in 

 the way towards D> then in the way towards M, (becaufc ic 

 pafleth a longer line in the fame tin.e, as al/b it did formerly in 

 the aire} fo likewife is the force that movech it that way great- 

 er then the force which movcth it the other. And therefore the 

 fame proportions that were in the motion, before it came to the 

 refifting pafTage, will remain alfo in it : at the leaftumill co- 

 ming near the fide at which it goeth out, the refittancebc 

 vcakned by the thinneflc of the rcfiftcnt theie: which bccaufa 

 it muft needs happen on the fide that hath leaft thick nefle, 

 the ball muft comequently.turn the other way, where it finde-.h 

 greateft yielding : and fb at its getting out into the free aire, ic. 

 will bend from the greater refiftance, in fuch manner as we 

 have faid above. 



Neither do the examples brought by Monficur EXesCarccs * 

 and others in maintenance of 'this do^rinc any c!iins 



D 



